Sam Altman, the chief executive of Open AI, was pushed out of the company by its board of directors on Friday. The news was a complete shock to much of the company’s employee base and to its largest corporate partner, Microsoft. Silicon Valley insiders are scrambling to get answers on exactly what happened and why the board’s decision seemed so abrupt. We rundown what we know and the many things we still don’t. Subscribe today at nytimes.com/podcasts or on Apple Podcasts and Spotify. You can also subscribe via your favorite podcast app here https://www.nytimes.com/activate-access/audio?source=podcatcher. For more podcasts and narrated articles, download The New York Times app at nytimes.com/app.